SU861378A1 - Paint for deep or flexographic printing - Google Patents

Description

(54) PAINT FOR DEEP OR FLEXOGRAPHIC The invention relates to the printing industry, namely to inks for intaglio or flexographic printing. Known ink for intaglio or flexographic printing of the composition: 0.5-20 wt.% Copolymer of styrene with maleic anhydride with a molecular weight (m) of 500-5000 with a weight ratio of styrene and maleic anhydride of 0.2: 1-4: 1, the pigment and the rest of the solvent is water l1. The disadvantage of such a paint is the low resistance of the imprint to the action of the impregnating solution applied to the sealed substrate (5 points). According to the test procedure, 2-3 points a satisfactory result, 4-5 points - an unsatisfactory result. The purpose of the invention is to increase the durability of the imprint to the effect of the impregnating solution applied to a sealed substrate. PRINTING The goal is achieved by the fact that the paint is known as a copolymer of styrene with maleic anhydride. CONTAINS a copolymer with a molecular weight of 90000-100000 with a weight ratio of styrene and maleic anhydride of 0.5: 1 - 2: 1, and as a solvent, a mixture of water and aliphatic alcohol with the number of carbon atoms SL-Cd at a ratio of 50:50 -90: 10, respectively, with the following content of components, wt.%: A copolymer of styrene with maleic anhydride 10-15 Pigment4-25 Solvent The remaining Synthesis of a copolymer is carried out by the method of radical copolymer simulating styrene with maleic anhydride in cyclohexanone with a ratio of 0.5: 1 to 2: 1 (preferably 1: 1, respectively). Benzoyl peroxide is used as the polymerization initiator. To regulate the molecule 3861378

Tertiary dodecyl mercaptan is used for the mass of copolymer, the copolymer is neutralized with 25% aqueous ammonia to pH 7.6-7.8. It is dissolved with stirring in a water-alcohol mixture.

Examples of the compositions of the proposed paint are given in table.1.

Table

Copolymer of styrene with maleic anhydride, m. 100,000, the ratio of styrene and maleic anhydride, 0

m, 90000, the ratio of 0.8: 1

m. m. 90000, ratio 1: 1

m, 100,000, ratio 2: 1

m.m, 100000, ratio 1: 1

Pigment - carbon black DMG-105A

Pigment yellow lightfast

Pigment red iron oxide

Phthalocyanine blue pigment

Krone yellow Solvent;

water and ethyl alcohol (50:50)

water and butyl alcohol (90:10)

Water and isopropyl alcohol. (60:40)

water and ethyl alcohol (70:30;

13

ten

15

ten

25

20

Ostal

The rest

Rest

Rest

Claims (2)

The rest is prepared in a ball mill (attritor or bead mill). A solution of a copolymer of styrene and maleic anhydride in a solvent is preliminarily prepared in a solvent, loaded into an attritor, pigment is added and dispersed to a particle size of 10 microns. For printing, the ink is diluted with the remaining amount of solvent to a viscosity of 18-20 s. The dyes obtained are shown in Table. 2. Table Impregnating solution has the composition, wt.%: Impregnating urea-formaldehyde resin PMF84.39 Emulsion polyester (contains impregnating polystyrene resin grade PN-35 and wetting agent NB-Non-cal) 10.5 Ammonium Chloride U / o-nyi1.6 Cumol hydroperoxide ( hyperise) 0.01 Water3,5 Thus, the resistance of the imprint to the action of the impregnating solution applied to the sealed substrate is improved from 4-5 to 2 points. Claims of Invention for intaglio or flexographic printing containing measures of styrene with maleic anhydride, pigment and solvent o t and in order to increase the resistance-imprint to the action of the impregnating solution applied to the sealed substrate, the paint contains a copolymer with a molecular weight of 90000-100000 with a weight ratio of styrene and maleic anhydride as copolymer of styrene with maleic anhydride 0.5: 1 - 2: 1, and as a solvent - a mixture of water and aliphatic alcohol with the number of carbon atoms SL-Cd at a ratio of 50-50 - 90:10, respectively, with the following content of components, weight,%: Styrene copolymer with maleic anhydride 10-15 Pig ment4-25 Thinner Solvent Other Sources of information that are taken into account in examination 1, Japan Patent No. 53-33147, l. C 09 D 11/02, published, 1978 (prototype),